#include<stdio.h>
int main()
{
    int a,b,c,max;
    printf("please input a,b,c");
    scanf("%d,%d,%d",&a,&b,&c);
    if(a>b)
    {
        if(a>c)
        max=a;
        else
        max=c;
    }
    else
        if(b>c)
        max=b;
        else 
        max=c;
    printf("%d\n",max);
}